Dissolved Air Flotation can be employed to remove high inlet levels of organics, suspended solids, oil and grease from industrial water and waste water. The microbubble DAF provides a practical solution to hard-to-handle water treatment problems.
A recycle feed pump transfers water to an air dissolving vessel and compressed air is then injected into the vessel. The air/water mixture is held pressurized in the vessel long enough for the air to dissolve in the water. When flowing through a pressure release valve, tiny, microscopic bubbles develop forming a white cloud of air in the water. The bubbles become attached to the suspended solids, oil and grease in the inlet water. Impurities float to the top of the flotation chamber. A moving scraper pushes the float, the formed waste, into further treatment. The other method of removing the floating sludge is to raise the chamber level and let the float freely overflow.